Quote:
Originally Posted by Bob KellyIII
OK here is a pic of my shock on the ground under the bike....
and a pic of the 2 springs I have, the Red one is the stock shock spring and the blue one is the one from Race tech. the last 3 numbers on it are 496 so I am assuming that means it is a 496 lb spring.
....
Bob....
|
Well, there's your problem. Factory spring is dual-rate design. Probably starts at about 300-lb/in. Then after 1-2" of compression or so, it switches to 600-lbs/in (8 active coils go down to 4). That's why you're getting beat up when it hits bumps.
RaceTech single-rate spring starts out too stiff compared to stock. That's probably why you've got way too much preload and zero sag with it installed.
I say get 300-lb/in 10" spring and be done with it! All this messing around without quantitative data wastes lots of time & money.
BTW - do you have manual that shows how shock goes together? Or take photo from side with it installed so we can see how linkage connects frame & swingarm.
I'm thinking rising-rate linkage combined with dual-rate spring is too much increase in wheel-rate as suspension compresses. Rising-rate is crutch and hedge against good suspension design. Modern suspension designs are getting away from rising-rate linkages and attaching shock directly to swingarm.
Here's one from GSXR1000
Aprilia Dorsoduro
